<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="(good ,index) in cartInfoList" :key="good.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list"
                   :checked="good.isChecked==1"
                   @change="updateChecked(good,$event)">
          </li>
          <li class="cart-list-con2">
            <img :src="good.imgUrl">
            <div class="item-msg">{{good.skuName}}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{good.skuPrice}}.00</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="headler('mins',-1,good)">-</a>
            <input autocomplete="off" type="text" :value="good.skuNum" minnum="1" class="itxt" @change="headler('change',$event.target.value*1,good)">
            <a href="javascript:void(0)" class="plus" @click="headler('add',+1,good)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ good.skuPrice * good.skuNum }}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="DeleteCartGood(good.skuId)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked="isAllCheck" @change="updateAllChecked($event)">
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteAllChecked">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>0</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {mapGetters} from "vuex";
import throttle from 'lodash/throttle'

export default {
  name: 'ShopCart',
  mounted() {
      this.getCart();
  },
  methods:{
    //获取购物车商品列表
    getCart(){
      this.$store.dispatch('getCartList')
    },
    //headler节流 加减点击节流
    headler:throttle(async function (type,disNum,good){
        //type:+/- input三种触发情况
        //disNum:+1/-1 input的最终值 三种变化量
        //good：处理的是哪个商品
        switch (type){
          case 'add':
            disNum=1;
            break;
          case 'mins':
            disNum=good.skuNum>1?-1:0;
            break;
          case 'change':
            if(isNaN(disNum)||disNum<1){
              disNum=0;
            }else {
              disNum=parseInt(disNum)-good.skuNum;
            }
            // disNum=(isNaN(disNum)||disNum<1)?0:parseInt(disNum)-good.skuNum;//三元简写形式
            break;
        }
        //派发actions
        try {
          //像后端发起请求，更新购物车后台数据
          await this.$store.dispatch('addOrUpdateShopCart',{skuId:good.skuId,skuNum:disNum})
          //更新购物车页面
          this.getCart();
        }catch (error){
          alert(error.message)
        }
    },500),
    //删除购物车某一商品
    DeleteCartGood(skuId){
      try {
        this.$store.dispatch('deleteCartList',skuId)
      }catch (error){
        alert(error.message)
      }
      //更新购物车页面
      this.getCart();
    },
    //修改某一个商品的勾选状态
    updateChecked(good,event){
      let checked=event.target.checked?'1':'0';
      //派发actions，在actions中发起访问请求
      try {
        this.$store.dispatch('updateCheckedById',{skuId:good.skuId,isChecked:checked});
        this.getCart();
      }catch (error){
        alert(error.message)
      }
    },
    //删除所有勾选的产品
    async deleteAllChecked(){
      try {
        //派发actions
        await this.$store.dispatch('deleteAllCheckedList');
        //重新获取购物车列表
        this.getCart();
      }catch (error){
        alert(error.message)
      }
    },
    //勾选全选框控制所有商品的勾选
    async updateAllChecked(event){
      try {
        await this.$store.dispatch('updateAllChecked',event.target.checked?'1':'0')
        this.getCart();
      }catch (error){
        return error.message;
      }
    }
  },
  computed:{
    ...mapGetters(['cartList']),
    cartInfoList(){
      return this.cartList.cartInfoList|| []
    },
    totalPrice(){
      let sum=0;
      this.cartInfoList.forEach((good)=>{
        sum+=good.skuPrice*good.skuNum;
      })
      return sum;
    },
    isAllCheck(){
      //every是forEach的break用法，
      //遍历数组里面原理，只要全部元素isChecked属性都为1===>真 true
      //只要有一个不是1======>假false
      let checked= this.cartInfoList.every((good)=>good.isChecked==1)
      return checked;
    },
  }
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      &>div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;

      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        &>li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con4 {
          width: 10%;

        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>